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GFCI stands for Ground Fault Circuit Interrupter, a standard safety addition to home power outlets. In rooms where moisture is more likely, like the bathroom and kitchen, GFCI outlets stop the current when certain kinds of shorts are detected, preventing shocks. Both GFCI and the similar AFCI (Arc Fault Circuit Interrupter) outlets are polarized and have clear indicators on the receptacle where hot wiring should go.

If you’re someone who likes to tinker around the house and make DIY repairs, a multimeter or voltmeter can be a great tool to have around, especially if you’re comfortable with electrical repairs. That said, if working with electricity feels out of your depth, you don’t need to invest in a multimeter. Reach out to an electrical pro for any electrical work you need done if any part of you is hesitant about a project.

It’s possible to distinguish a positive black wire from a negative black wire if you know what type of circuit the wires are in. If it’s an alternating current (AC), then black wires are positive. If it’s a direct current (DC), then black wires are negative. 

Sometimes, a circuit has two black wires. In that case, the positive black wire will be solid black while the negative black wire will have a white stripe on it. If you’re still unsure, you can use a multimeter to check.

You can add an electrical outlet outside by sending a wire through the wall from an existing interior outlet. Without having to open up walls, you can thread a new electrical cable from the existing outlet through the wall and to the exterior. You’ll need to cut a hole in the siding to place your new outlet. Ensure that your outdoor outlet is a GFCI outlet (ground fault circuit interrupter outlet) per the National Electrical Code. It’s best to hire an electrician to add an outdoor outlet unless you have previous electrical experience.